In an electrically heated home, the temperature of the ground in contact with a concrete basement wall is 11.9 °C. The temperature at the inside surface of the wall is 19.0 °C. The wall is 0.13 m thick and has an area of 7.5 m². Assume that one kilowatt hour of electrical energy costs $0.10. How many hours are required for one dollar's worth of energy to be conducted through the wall? Number i Units

A typical coal-fired power plant burns 300 metric tons of coal every hour to generate 2.7 × 106 MJ of electric energy. 1 metric ton = 1000 kg; 1 metric ton of coal has a volume of 1.5 m3. The heat of combustion of coal is 28 MJ/kg. Assume that all heat is transferred from the fuel to the boiler and that all the work done in spinning the turbine is transformed into electric energy.a. Suppose the coal is piled up in a 10 m × 10 m room. How tall must the pile be to operate the plant for one day?b. What is the power plant’s efficiency?

Assume that Q₁ = -15.0 J and Q2 = -80.0 J in (Figure 1). For help with math skills, you may want to review: Substituting Numbers into Mathematical Expressions For general problem-solving tips and strategies for this topic, you may want to view a Video Tutor Solution of Heat engine details. Figure p (kPa) 400 200 0 0 [] 2₁ 100 200 < 22 1 of 1 -V (cm³) Part A What is Wout for the heat engine shown in the figure? Express your answer with the appropriate units. Wout= Submit Request Answer Part B Value QH = What is QH for the heat engine shown in the figure? Express your answer with the appropriate units. Units Value Units ? ?

Question 5 Specific Heat of Solid Substances Substance D Aluminum B silver; because it is a transition metal with the lowest specific heat value C Iron Copper Tin Given the specific heat information presented, which substance would make the BEST material to create a pan for cooking and why? D Specific Heat (J/kg°C) 899 443 385 213 Tin - because it has a low specific heat, which means it conducts heat the best. Aluminum - because it has a high specific heat, which means it conducts heat the best. Copper - because it has a mid-level specific heat, which means it is a good insulator. Iron - because it has a mid-level specific heat, which means it is a good conductor.

A small electric immersion heater is used to heat 83 g of water for a cup of instant coffee. The heater is labeled "69 watts" (it converts electrical energy to thermal energy at this rate). Calculate the time required to bring all this water from 19°C to 100°C, ignoring any heat losses. (The specific heat of water is 4186 J/kg-K.) Number i Units

An air-filled cylinder with a movable piston has a heat reservoir in contact with it. The heat reservoir transfers 850 J of energy into the cylinder. Due to the energy transfer, the piston does 437 J of work on the environment. What is the change in internal energy of the system?